Sedimentary record of PAHs in the Barigui River and its relation to the socioeconomic development of Curitiba, Brazil

Machado, Karina Scurupa; Figueira, Rubens César Lopes; Côcco, Lílian Cristina; Froehner, Sandro; Fernandes, Cristóvão Vicente Scapulatempo; Ferreira, Paulo Martins

doi:10.1016/j.scitotenv.2014.02.106

Cited by 39 publications

(25 citation statements)

References 42 publications

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“…S1 in the Supplementary materials. The location of the 137 Cs peak of 1963, reported in Machado et al (2014), relative to the global maximum fallout from a past nuclear explosion was used to compare and verify the dating results that are presented in this study.…”

Section: Dating Resultsmentioning

confidence: 96%

“…Among the terrestrial sources of organic matter, detritus from deforestation are the main causes of nutrient input into lakes and rivers because plants are removed and entrained throughout the watershed, and soil is exposed, contributing to erosion in the catchment area. In the same area, Machado et al (2014) have demonstrated the impact of grass and wood combustion due to PAH distribution. Therefore, the increase of the TOC/TN ratios in the period 1840 to 1920 as observed in the present study seems to be related to the removal of vegetation, whether by deforestation or bush fire.…”

Section: Temporal Variability Of Nutrientsmentioning

confidence: 92%

“…This site was selected based on previous monitoring campaigns that defined this area as suitable for collection, since this area has been strongly influenced by urbanization over time (Froehner and Martins, 2008;Dombroski et al, 2012;Machado et al, 2014).…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…Details of the dating analyses are found elsewhere (Machado et al, 2014), and are herein described just briefly. In order to determine the date of each sediment core segment, radionuclides 210 Pb, 226 Ra,and 137 Cs counting were analyzed in an EG&G ORTEC® low-background gamma spectrometer (hyper-pure Ge, model GMX25190P) following the method described by Figueira (2000).…”

Section: Dating Of the Sedimentary Corementioning

confidence: 99%

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Assessment of historical fecal contamination in Curitiba, Brazil, in the last 400 years using fecal sterols

Machado

Froehner

Sánez

et al. 2014

Science of The Total Environment

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Section: Dating Resultsmentioning

confidence: 96%

Section: Temporal Variability Of Nutrientsmentioning

confidence: 92%

Section: Study Area and Samplingmentioning

confidence: 99%

Section: Dating Of the Sedimentary Corementioning

confidence: 99%

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Assessment of historical fecal contamination in Curitiba, Brazil, in the last 400 years using fecal sterols

Machado

Froehner

Sánez

et al. 2014

Science of The Total Environment

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“…Two models were used to calculate the sedimentation rate [26]: concentration initial concentration of unsupported [26][27][28]). From that point, the depth age curve was extrapolated using the lower most calculated MAR, factoring in changes in laminate thickness [29].…”

Section: Methodsmentioning

confidence: 99%

Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Machado¹,

Froehnerb²

2015

J Earth Sci Clim Change

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Keywords: Climatic changes; Little ice age; n-Alkane distributions; GDGT proxies IntroductionThe period which was subjected to much colder winters followed by warmer periods is known as the little ice age (LIA). It documented as being between about 1300 and 1870 (Mann, 2002). However, climate change could vary geographically [1]. The period is divided into two phases; the first was around 1300 until the late 1400s and the second warmer period was in in the 1500s [2]. The period between 1600 and 1850 marks its height and was characterized by changes in the hydrological cycle and perturbation of the ecosystem [2-4].Even although there much evidence for the LIA, the causes and mechanism are still under debate. The only certainty is that it was a global event. Most studies have focused on the northern hemisphere [3][4][5], and there are few studies demonstrating the occurrence of the event in the southern hemisphere. For instance, in South America [6,7], advance in glaciers in the Andes was demonstrated [8], as well as aridity in the lowlands of Argentina [9] and Venezuela [8], and there is evidence from mountain glaciers suggesting increasing glaciation in Patagonia [10]. In Brazil, some studies have demonstrated change in vegetation composition during the LIA and sea level regression in northeastern and southeastern Brazil [11][12][13].At present, paleoclimate can be reconstructed due the widespread occurrence of biomarkers multi-proxy data derived from them. The spatial and temporal character of such putative climate epochs revived the discussion and understanding of and mechanism for the LIA, as well as of the implications for climate change in the future.Typically, n-alkanes are derived from different sources (algae, photosynthetic bacteria and higher plants [14]. Different distribution patterns of n-alkanes in sediments provides information about different climatic environments and hence is widely used to understand the evolution of vegetation and reconstruct environmental changes [14,15]. The magnitude of the anthropogenic impact on the climate and the environment was recently measured from biomarker distributions [4,14]. Yet, some biomarkers can be more specific in their information than n-alkanes. For example, increasing attention has been driven to glycerol dialkyl glycerol tetraether (GDGT) compounds, polar basic constituents of the cell membrane and comprising a polar head group bonded to a non-polar hydrocarbon [16]. The structures of GDGTs are temperature dependent. When temperature increases, cyclopentane moieties are formed within the isoprenoid chain [17]. With more cyclopentane rings, the membrane is kept in a liquid crystalline state and, as a consequence, proton permeation is reduced.According to Weijers et al. [18] there are some environmental controls on the distributions of GDGTs, so two indices were proposed for quantifying the degree of methylation (MBT) and cyclization (CBT), both being effective in palaeoenvironmental studies to reconstruct mean annual air temperature (MAAT). Since branche...

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Characterization of quality of sediments from Paranaguá Bay (Brazil) by combined in vitro bioassays and chemical analyses

Rizzi

Pérez-Albaladejo

Fernandes

et al. 2016

Enviro Toxic and Chemistry

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The present study characterizes the quality of sediments from the Paranaguá Estuarine Complex (South Brazil). Polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and organochlorine pesticides (OCPs) were determined in sediment samples together with a series of different in vitro bioassays. The fish hepatoma cell line (PLHC-1) was used to determine the presence of cytotoxic compounds and CYP1A- and oxidative stress-inducing agents in sediment extracts. Ovarian microsomal fractions from sea bass (Dicentrarchus labrax) were used to detect the presence of endocrine disrupters that interfered with the synthesis of estrogens (ovarian CYP19). Despite the relatively low levels of pollutants and no evidence of negative effects based on guideline levels, sediments collected close to harbors were enriched with CYP1A-inducing agents and they showed higher cytotoxicity. In contrast, sediments from internal areas inhibited CYP19 activity, which suggests the presence of endocrine disrupters at these sites. Overall, the selected bioassays and the chemistry data led to the identification of potentially impacted areas along the Paranaguá Estuarine Complex that would require further action to improve their environmental quality. Environ Toxicol Chem 2017;36:1811-1819. © 2016 SETAC.

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Sedimentary record of PAHs in the Barigui River and its relation to the socioeconomic development of Curitiba, Brazil

Cited by 39 publications

References 42 publications

Assessment of historical fecal contamination in Curitiba, Brazil, in the last 400 years using fecal sterols

Assessment of historical fecal contamination in Curitiba, Brazil, in the last 400 years using fecal sterols

Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Characterization of quality of sediments from Paranaguá Bay (Brazil) by combined in vitro bioassays and chemical analyses

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